Remove is_dllimport_foreign_item def from cg_ssa

It overwrites the definition from rustc_metadata

compiler/rustc_middle/src/query/mod.rs

@@ -1259,11 +1259,6 @@ rustc_queries! {
     }
 
     Other {
-        query dllimport_foreign_items(_: CrateNum)
-            -> FxHashSet<DefId> {
-            storage(ArenaCacheSelector<'tcx>)
-            desc { "dllimport_foreign_items" }
-        }
         query is_dllimport_foreign_item(def_id: DefId) -> bool {
             desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
         }